On the one hand, it might be true that co-evolution with mostly lost megaherbivores is common and perhaps ubiquitous, given the state the world is in. On the other hand, it can be all too easy to jump to conclusions about perceptions of co-evolution and we often need to consider other possibilities: plants may grow tall, may grow weird or giant fruit, or may exhibit ‘defensive’ adaptations for reasons unrelated to the presence of their predators, for example, since plants have complex evolutionary interactions all their own. Indeed, some classic alleged examples of co-evolution that supposedly involve lost partners are now thought to be erroneous.See also: The Ghosts of Evolution: Nonsensical Fruit, Missing Partners, and Other Ecological Anachronisms by Connie Barlow.
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